. >> about a million and a half people with parkinson's in the united states so it's a common condition and something that people should try to work to help prevent and treat. >> and are there good medications out there to help with this now? >> as you can tell, i have a tiny tremor but no one knew besides my family and the reason is because there's quite good treatment. it's actually old fashioned treatment, levodopa is the common treatment to replace the dopamine that you lose, the neurotransmitter in your brain that's reduced in parkinson's gets replaced by levodopa but there's need for better medications. >> and to help fund the things people need and that's what the walk is about. thank you so much for coming in. >> thanks for having us. >> more news coming up. >> it's an eye-catching message on john's hopkins university campus, how dangerous distracted walking can be. a new campaign near the discretion of st. paul and 33rd streets is aimed to get students to put down cell phones and pay attention. kai reed has more. >> 12 hours, 3,000 shoes and one life-saving message. >> stop, do